Manual pre-allocation of supply order proposals can be done in 'Pre-allocation. Perform Detailed' (MWS121). You can confirm or release a supply order proposal on the lowest level and later connect it manually to, for example, a MO proposal.
If you have products in stock that you want to use in a supply chain instead of manufacturing new ones, you can transfer a pre-allocation against the proposal to an allocation against stock.
In (MWS121) make an allocation of the supply chain demand to the stock and the existing pre-allocation (against the supplying order) is transferred to a real allocation against stock.
If parameter ‘Allocate stock’ in 'Supply Chain Policy. Open' (CRS709) is selected, the sequence in which the supply chain determines how to explode the supply chain is changed. This means that before creating the next level in the supply chain, a check is made against existing stock to see if there is anything that can be used.
Search order for supply chain generation: